There's no shortage of options for those looking to add some extra audio oomph to their iPad. From the multitude of docks on offer to Bluetooth or Airplay-enabled wireless speaker systems and more portable options such as the Logitech Tablet Speaker or iLuv iSP150. But none are as portable as the Sound Cover, which as the name suggests, combines stereo speakers with that most ubiquitous of iPad accessories, the cover.